diff --git a/src/Donations/Endpoints/Endpoint.php b/src/Donations/Endpoints/Endpoint.php
index 826cbdee34..d64d5a5b44 100644
--- a/src/Donations/Endpoints/Endpoint.php
+++ b/src/Donations/Endpoints/Endpoint.php
@@ -35,6 +35,7 @@ public function validateInt($value)
     public function validateDate($param, $request, $key)
     {
         // Check that date is valid, and formatted YYYY-MM-DD
+        if (substr_count($param, '-') !== 2) return false;
         list($year, $month, $day) = explode('-', $param);
         $valid = checkdate($month, $day, $year);